build: add localhost:8050 development build configuration

新增本地开发环境8050端口的构建配置，包含UNI_PLATFORM和UNI_APP_DOMAIN环境变量以及生产模式定义

package.json

@@ -66,7 +66,17 @@
         "define": {
           "PRODUCTION": true
         }
-      }
+      },
+      "http://localhost:8050/": {
+        "title": "H5-localhost:8050",
+        "env": {
+          "UNI_PLATFORM": "h5",
+          "UNI_APP_DOMAIN": "http://localhost:8050/"
+        },
+        "define": {
+          "PRODUCTION": true
+        }
+      }      
     }
   }
 }